1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 #ifdef __FreeBSD__
30 #endif
31
32 /*
33 * IEEE 802.11 WDS mode support.
34 */
35 #include "opt_inet.h"
36 #include "opt_wlan.h"
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/mbuf.h>
41 #include <sys/malloc.h>
42 #include <sys/kernel.h>
43
44 #include <sys/socket.h>
45 #include <sys/sockio.h>
46 #include <sys/endian.h>
47 #include <sys/errno.h>
48 #include <sys/proc.h>
49 #include <sys/sysctl.h>
50
51 #include <net/if.h>
52 #include <net/if_var.h>
53 #include <net/if_media.h>
54 #include <net/if_llc.h>
55 #include <net/ethernet.h>
56
57 #include <net/bpf.h>
58
59 #include <net80211/ieee80211_var.h>
60 #include <net80211/ieee80211_wds.h>
61 #include <net80211/ieee80211_input.h>
62 #ifdef IEEE80211_SUPPORT_SUPERG
63 #include <net80211/ieee80211_superg.h>
64 #endif
65
66 static void wds_vattach(struct ieee80211vap *);
67 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
68 static int wds_input(struct ieee80211_node *ni, struct mbuf *m,
69 const struct ieee80211_rx_stats *rxs, int, int);
70 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype,
71 const struct ieee80211_rx_stats *, int, int);
72
73 void
ieee80211_wds_attach(struct ieee80211com * ic)74 ieee80211_wds_attach(struct ieee80211com *ic)
75 {
76 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
77 }
78
79 void
ieee80211_wds_detach(struct ieee80211com * ic)80 ieee80211_wds_detach(struct ieee80211com *ic)
81 {
82 }
83
84 static void
wds_vdetach(struct ieee80211vap * vap)85 wds_vdetach(struct ieee80211vap *vap)
86 {
87 if (vap->iv_bss != NULL) {
88 /* XXX locking? */
89 if (vap->iv_bss->ni_wdsvap == vap)
90 vap->iv_bss->ni_wdsvap = NULL;
91 }
92 }
93
94 static void
wds_vattach(struct ieee80211vap * vap)95 wds_vattach(struct ieee80211vap *vap)
96 {
97 vap->iv_newstate = wds_newstate;
98 vap->iv_input = wds_input;
99 vap->iv_recv_mgmt = wds_recv_mgmt;
100 vap->iv_opdetach = wds_vdetach;
101 }
102
103 static void
wds_flush(struct ieee80211_node * ni)104 wds_flush(struct ieee80211_node *ni)
105 {
106 struct ieee80211com *ic = ni->ni_ic;
107 struct mbuf *m, *next;
108 int8_t rssi, nf;
109
110 m = ieee80211_ageq_remove(&ic->ic_stageq,
111 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
112 if (m == NULL)
113 return;
114
115 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
116 "%s", "flush wds queue");
117 ic->ic_node_getsignal(ni, &rssi, &nf);
118 for (; m != NULL; m = next) {
119 next = m->m_nextpkt;
120 m->m_nextpkt = NULL;
121 ieee80211_input(ni, m, rssi, nf);
122 }
123 }
124
125 static int
ieee80211_create_wds(struct ieee80211vap * vap,struct ieee80211_channel * chan)126 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
127 {
128 struct ieee80211com *ic = vap->iv_ic;
129 struct ieee80211_node_table *nt = &ic->ic_sta;
130 struct ieee80211_node *ni, *obss;
131
132 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
133 "%s: creating link to %s on channel %u\n", __func__,
134 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
135
136 /* NB: vap create must specify the bssid for the link */
137 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
138 /* NB: we should only be called on RUN transition */
139 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
140
141 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
142 /*
143 * Dynamic/non-legacy WDS. Reference the associated
144 * station specified by the desired bssid setup at vap
145 * create. Point ni_wdsvap at the WDS vap so 4-address
146 * frames received through the associated AP vap will
147 * be dispatched upward (e.g. to a bridge) as though
148 * they arrived on the WDS vap.
149 */
150 IEEE80211_NODE_LOCK(nt);
151 obss = NULL;
152 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
153 if (ni == NULL) {
154 /*
155 * Node went away before we could hookup. This
156 * should be ok; no traffic will flow and a leave
157 * event will be dispatched that should cause
158 * the vap to be destroyed.
159 */
160 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
161 "%s: station %s went away\n",
162 __func__, ether_sprintf(vap->iv_des_bssid));
163 /* XXX stat? */
164 } else if (ni->ni_wdsvap != NULL) {
165 /*
166 * Node already setup with a WDS vap; we cannot
167 * allow multiple references so disallow. If
168 * ni_wdsvap points at us that's ok; we should
169 * do nothing anyway.
170 */
171 /* XXX printf instead? */
172 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
173 "%s: station %s in use with %s\n",
174 __func__, ether_sprintf(vap->iv_des_bssid),
175 ni->ni_wdsvap->iv_ifp->if_xname);
176 /* XXX stat? */
177 } else {
178 /*
179 * Committed to new node, setup state.
180 */
181 obss = vap->iv_update_bss(vap, ni);
182 ni->ni_wdsvap = vap;
183 }
184 IEEE80211_NODE_UNLOCK(nt);
185 if (obss != NULL) {
186 /* NB: deferred to avoid recursive lock */
187 ieee80211_free_node(obss);
188 }
189 } else {
190 /*
191 * Legacy WDS vap setup.
192 */
193 /*
194 * The far end does not associate so we just create
195 * create a new node and install it as the vap's
196 * bss node. We must simulate an association and
197 * authorize the port for traffic to flow.
198 * XXX check if node already in sta table?
199 */
200 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
201 if (ni != NULL) {
202 obss = vap->iv_update_bss(vap, ieee80211_ref_node(ni));
203 ni->ni_flags |= IEEE80211_NODE_AREF;
204 if (obss != NULL)
205 ieee80211_free_node(obss);
206 /* give driver a chance to setup state like ni_txrate */
207 if (ic->ic_newassoc != NULL)
208 ic->ic_newassoc(ni, 1);
209 /* tell the authenticator about new station */
210 if (vap->iv_auth->ia_node_join != NULL)
211 vap->iv_auth->ia_node_join(ni);
212 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
213 ieee80211_node_authorize(ni);
214
215 ieee80211_notify_node_join(ni, 1 /*newassoc*/);
216 /* XXX inject l2uf frame */
217 }
218 }
219
220 /*
221 * Flush any pending frames now that were setup.
222 */
223 if (ni != NULL)
224 wds_flush(ni);
225 return (ni == NULL ? ENOENT : 0);
226 }
227
228 /*
229 * Propagate multicast frames of an ap vap to all DWDS links.
230 * The caller is assumed to have verified this frame is multicast.
231 */
232 void
ieee80211_dwds_mcast(struct ieee80211vap * vap0,struct mbuf * m)233 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
234 {
235 struct ieee80211com *ic = vap0->iv_ic;
236 const struct ether_header *eh = mtod(m, const struct ether_header *);
237 struct ieee80211_node *ni;
238 struct ieee80211vap *vap;
239 struct ifnet *ifp;
240 struct mbuf *mcopy;
241 int err;
242
243 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
244 ("%s not mcast", ether_sprintf(eh->ether_dhost)));
245
246 /* XXX locking */
247 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
248 /* only DWDS vaps are interesting */
249 if (vap->iv_opmode != IEEE80211_M_WDS ||
250 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
251 continue;
252 /* if it came in this interface, don't send it back out */
253 ifp = vap->iv_ifp;
254 if (ifp == m->m_pkthdr.rcvif)
255 continue;
256 /*
257 * Duplicate the frame and send it.
258 */
259 mcopy = m_copypacket(m, IEEE80211_M_NOWAIT);
260 if (mcopy == NULL) {
261 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
262 /* XXX stat + msg */
263 continue;
264 }
265 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
266 if (ni == NULL) {
267 /* NB: ieee80211_find_txnode does stat+msg */
268 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
269 m_freem(mcopy);
270 continue;
271 }
272 /* calculate priority so drivers can find the tx queue */
273 if (ieee80211_classify(ni, mcopy)) {
274 IEEE80211_DISCARD_MAC(vap,
275 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
276 eh->ether_dhost, NULL,
277 "%s", "classification failure");
278 vap->iv_stats.is_tx_classify++;
279 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
280 m_freem(mcopy);
281 ieee80211_free_node(ni);
282 continue;
283 }
284
285 BPF_MTAP(ifp, m); /* 802.3 tx */
286
287 /*
288 * Encapsulate the packet in prep for transmission.
289 */
290 IEEE80211_TX_LOCK(ic);
291 mcopy = ieee80211_encap(vap, ni, mcopy);
292 if (mcopy == NULL) {
293 /* NB: stat+msg handled in ieee80211_encap */
294 IEEE80211_TX_UNLOCK(ic);
295 ieee80211_free_node(ni);
296 continue;
297 }
298 mcopy->m_flags |= M_MCAST;
299 MPASS((mcopy->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
300 mcopy->m_pkthdr.rcvif = (void *) ni;
301
302 err = ieee80211_parent_xmitpkt(ic, mcopy);
303 IEEE80211_TX_UNLOCK(ic);
304 if (!err) {
305 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
306 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
307 if_inc_counter(ifp, IFCOUNTER_OBYTES,
308 m->m_pkthdr.len);
309 }
310 }
311 }
312
313 /*
314 * Handle DWDS discovery on receipt of a 4-address frame in
315 * ap mode. Queue the frame and post an event for someone
316 * to plumb the necessary WDS vap for this station. Frames
317 * received prior to the vap set running will then be reprocessed
318 * as if they were just received.
319 */
320 void
ieee80211_dwds_discover(struct ieee80211_node * ni,struct mbuf * m)321 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
322 {
323 struct ieee80211com *ic = ni->ni_ic;
324
325 /*
326 * Save the frame with an aging interval 4 times
327 * the listen interval specified by the station.
328 * Frames that sit around too long are reclaimed
329 * using this information.
330 * XXX handle overflow?
331 * XXX per/vap beacon interval?
332 */
333 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
334 m->m_pkthdr.rcvif = (void *)(uintptr_t)
335 ieee80211_mac_hash(ic, ni->ni_macaddr);
336 (void) ieee80211_ageq_append(&ic->ic_stageq, m,
337 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
338 ieee80211_notify_wds_discover(ni);
339 }
340
341 /*
342 * IEEE80211_M_WDS vap state machine handler.
343 */
344 static int
wds_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)345 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
346 {
347 struct ieee80211com *ic = vap->iv_ic;
348 enum ieee80211_state ostate;
349 int error;
350
351 IEEE80211_LOCK_ASSERT(ic);
352
353 ostate = vap->iv_state;
354 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
355 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
356 vap->iv_state = nstate; /* state transition */
357 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
358 if (ostate != IEEE80211_S_SCAN)
359 ieee80211_cancel_scan(vap); /* background scan */
360 error = 0;
361 switch (nstate) {
362 case IEEE80211_S_INIT:
363 switch (ostate) {
364 case IEEE80211_S_SCAN:
365 ieee80211_cancel_scan(vap);
366 break;
367 default:
368 break;
369 }
370 if (ostate != IEEE80211_S_INIT) {
371 /* NB: optimize INIT -> INIT case */
372 ieee80211_reset_bss(vap);
373 }
374 break;
375 case IEEE80211_S_SCAN:
376 switch (ostate) {
377 case IEEE80211_S_INIT:
378 ieee80211_check_scan_current(vap);
379 break;
380 default:
381 break;
382 }
383 break;
384 case IEEE80211_S_RUN:
385 if (ostate == IEEE80211_S_INIT) {
386 /*
387 * Already have a channel; bypass the scan
388 * and startup immediately.
389 */
390 error = ieee80211_create_wds(vap, ic->ic_curchan);
391 }
392 break;
393 default:
394 break;
395 }
396 return error;
397 }
398
399 /*
400 * Process a received frame. The node associated with the sender
401 * should be supplied. If nothing was found in the node table then
402 * the caller is assumed to supply a reference to iv_bss instead.
403 * The RSSI and a timestamp are also supplied. The RSSI data is used
404 * during AP scanning to select a AP to associate with; it can have
405 * any units so long as values have consistent units and higher values
406 * mean ``better signal''. The receive timestamp is currently not used
407 * by the 802.11 layer.
408 */
409 static int
wds_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)410 wds_input(struct ieee80211_node *ni, struct mbuf *m,
411 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
412 {
413 struct ieee80211vap *vap = ni->ni_vap;
414 struct ieee80211com *ic = ni->ni_ic;
415 struct ifnet *ifp = vap->iv_ifp;
416 struct ieee80211_frame *wh;
417 struct ieee80211_key *key;
418 struct ether_header *eh;
419 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
420 uint8_t dir, type, subtype, qos;
421 int is_hw_decrypted = 0;
422 int has_decrypted = 0;
423
424 /*
425 * Some devices do hardware decryption all the way through
426 * to pretending the frame wasn't encrypted in the first place.
427 * So, tag it appropriately so it isn't discarded inappropriately.
428 */
429 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
430 is_hw_decrypted = 1;
431
432 if (m->m_flags & M_AMPDU_MPDU) {
433 /*
434 * Fastpath for A-MPDU reorder q resubmission. Frames
435 * w/ M_AMPDU_MPDU marked have already passed through
436 * here but were received out of order and been held on
437 * the reorder queue. When resubmitted they are marked
438 * with the M_AMPDU_MPDU flag and we can bypass most of
439 * the normal processing.
440 */
441 wh = mtod(m, struct ieee80211_frame *);
442 type = IEEE80211_FC0_TYPE_DATA;
443 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
444 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
445 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
446 goto resubmit_ampdu;
447 }
448
449 KASSERT(ni != NULL, ("null node"));
450
451 type = -1; /* undefined */
452
453 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
454 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
455 ni->ni_macaddr, NULL,
456 "too short (1): len %u", m->m_pkthdr.len);
457 vap->iv_stats.is_rx_tooshort++;
458 goto out;
459 }
460 /*
461 * Bit of a cheat here, we use a pointer for a 3-address
462 * frame format but don't reference fields past outside
463 * ieee80211_frame_min w/o first validating the data is
464 * present.
465 */
466 wh = mtod(m, struct ieee80211_frame *);
467
468 if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
469 ni->ni_inact = ni->ni_inact_reload;
470
471 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
472 IEEE80211_FC0_VERSION_0) {
473 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
474 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
475 wh->i_fc[0], wh->i_fc[1]);
476 vap->iv_stats.is_rx_badversion++;
477 goto err;
478 }
479
480 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
481 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
482 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
483
484 /* NB: WDS vap's do not scan */
485 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
486 IEEE80211_DISCARD_MAC(vap,
487 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
488 "too short (3): len %u", m->m_pkthdr.len);
489 vap->iv_stats.is_rx_tooshort++;
490 goto out;
491 }
492 /* NB: the TA is implicitly verified by finding the wds peer node */
493 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
494 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
495 /* not interested in */
496 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
497 wh->i_addr1, NULL, "%s", "not to bss");
498 vap->iv_stats.is_rx_wrongbss++;
499 goto out;
500 }
501 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
502 ni->ni_noise = nf;
503 if (IEEE80211_HAS_SEQ(type, subtype)) {
504 uint8_t tid = ieee80211_gettid(wh);
505 if (IEEE80211_QOS_HAS_SEQ(wh) &&
506 TID_TO_WME_AC(tid) >= WME_AC_VI)
507 ic->ic_wme.wme_hipri_traffic++;
508 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1, rxs))
509 goto out;
510 }
511 switch (type) {
512 case IEEE80211_FC0_TYPE_DATA:
513 hdrspace = ieee80211_hdrspace(ic, wh);
514 if (m->m_len < hdrspace &&
515 (m = m_pullup(m, hdrspace)) == NULL) {
516 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
517 ni->ni_macaddr, NULL,
518 "data too short: expecting %u", hdrspace);
519 vap->iv_stats.is_rx_tooshort++;
520 goto out; /* XXX */
521 }
522 if (dir != IEEE80211_FC1_DIR_DSTODS) {
523 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
524 wh, "data", "incorrect dir 0x%x", dir);
525 vap->iv_stats.is_rx_wrongdir++;
526 goto out;
527 }
528 /*
529 * Only legacy WDS traffic should take this path.
530 */
531 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
532 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
533 wh, "data", "%s", "not legacy wds");
534 vap->iv_stats.is_rx_wrongdir++;/*XXX*/
535 goto out;
536 }
537 /*
538 * Handle A-MPDU re-ordering. If the frame is to be
539 * processed directly then ieee80211_ampdu_reorder
540 * will return 0; otherwise it has consumed the mbuf
541 * and we should do nothing more with it.
542 */
543 if ((m->m_flags & M_AMPDU) &&
544 ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
545 m = NULL;
546 goto out;
547 }
548 resubmit_ampdu:
549
550 /*
551 * Handle privacy requirements. Note that we
552 * must not be preempted from here until after
553 * we (potentially) call ieee80211_crypto_demic;
554 * otherwise we may violate assumptions in the
555 * crypto cipher modules used to do delayed update
556 * of replay sequence numbers.
557 */
558 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
559 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
560 /*
561 * Discard encrypted frames when privacy is off.
562 */
563 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
564 wh, "WEP", "%s", "PRIVACY off");
565 vap->iv_stats.is_rx_noprivacy++;
566 IEEE80211_NODE_STAT(ni, rx_noprivacy);
567 goto out;
568 }
569 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
570 /* NB: stats+msgs handled in crypto_decap */
571 IEEE80211_NODE_STAT(ni, rx_wepfail);
572 goto out;
573 }
574 wh = mtod(m, struct ieee80211_frame *);
575 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
576 has_decrypted = 1;
577 } else {
578 /* XXX M_WEP and IEEE80211_F_PRIVACY */
579 key = NULL;
580 }
581
582 /*
583 * Save QoS bits for use below--before we strip the header.
584 */
585 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA)
586 qos = ieee80211_getqos(wh)[0];
587 else
588 qos = 0;
589
590 /*
591 * Next up, any fragmentation.
592 */
593 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
594 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
595 if (m == NULL) {
596 /* Fragment dropped or frame not complete yet */
597 goto out;
598 }
599 }
600 wh = NULL; /* no longer valid, catch any uses */
601
602 /*
603 * Next strip any MSDU crypto bits.
604 */
605 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
606 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
607 ni->ni_macaddr, "data", "%s", "demic error");
608 vap->iv_stats.is_rx_demicfail++;
609 IEEE80211_NODE_STAT(ni, rx_demicfail);
610 goto out;
611 }
612
613 /* copy to listener after decrypt */
614 if (ieee80211_radiotap_active_vap(vap))
615 ieee80211_radiotap_rx(vap, m);
616 need_tap = 0;
617
618 /*
619 * Finally, strip the 802.11 header.
620 */
621 m = ieee80211_decap(vap, m, hdrspace, qos);
622 if (m == NULL) {
623 /* XXX mask bit to check for both */
624 /* don't count Null data frames as errors */
625 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
626 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
627 goto out;
628 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
629 ni->ni_macaddr, "data", "%s", "decap error");
630 vap->iv_stats.is_rx_decap++;
631 IEEE80211_NODE_STAT(ni, rx_decap);
632 goto err;
633 }
634 if (!(qos & IEEE80211_QOS_AMSDU))
635 eh = mtod(m, struct ether_header *);
636 else
637 eh = NULL;
638 if (!ieee80211_node_is_authorized(ni)) {
639 /*
640 * Deny any non-PAE frames received prior to
641 * authorization. For open/shared-key
642 * authentication the port is mark authorized
643 * after authentication completes. For 802.1x
644 * the port is not marked authorized by the
645 * authenticator until the handshake has completed.
646 */
647 if (eh == NULL ||
648 eh->ether_type != htons(ETHERTYPE_PAE)) {
649 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
650 ni->ni_macaddr, "data", "unauthorized or "
651 "unknown port: ether type 0x%x len %u",
652 eh == NULL ? -1 : eh->ether_type,
653 m->m_pkthdr.len);
654 vap->iv_stats.is_rx_unauth++;
655 IEEE80211_NODE_STAT(ni, rx_unauth);
656 goto err;
657 }
658 } else {
659 /*
660 * When denying unencrypted frames, discard
661 * any non-PAE frames received without encryption.
662 */
663 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
664 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
665 (is_hw_decrypted == 0) &&
666 (eh == NULL ||
667 eh->ether_type != htons(ETHERTYPE_PAE))) {
668 /*
669 * Drop unencrypted frames.
670 */
671 vap->iv_stats.is_rx_unencrypted++;
672 IEEE80211_NODE_STAT(ni, rx_unencrypted);
673 goto out;
674 }
675 }
676 /* XXX require HT? */
677 if (qos & IEEE80211_QOS_AMSDU) {
678 m = ieee80211_decap_amsdu(ni, m);
679 if (m == NULL)
680 return IEEE80211_FC0_TYPE_DATA;
681 } else {
682 #ifdef IEEE80211_SUPPORT_SUPERG
683 m = ieee80211_decap_fastframe(vap, ni, m);
684 if (m == NULL)
685 return IEEE80211_FC0_TYPE_DATA;
686 #endif
687 }
688 ieee80211_deliver_data(vap, ni, m);
689 return IEEE80211_FC0_TYPE_DATA;
690
691 case IEEE80211_FC0_TYPE_MGT:
692 vap->iv_stats.is_rx_mgmt++;
693 IEEE80211_NODE_STAT(ni, rx_mgmt);
694 if (dir != IEEE80211_FC1_DIR_NODS) {
695 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
696 wh, "data", "incorrect dir 0x%x", dir);
697 vap->iv_stats.is_rx_wrongdir++;
698 goto err;
699 }
700 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
701 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
702 ni->ni_macaddr, "mgt", "too short: len %u",
703 m->m_pkthdr.len);
704 vap->iv_stats.is_rx_tooshort++;
705 goto out;
706 }
707 #ifdef IEEE80211_DEBUG
708 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
709 if_printf(ifp, "received %s from %s rssi %d\n",
710 ieee80211_mgt_subtype_name(subtype),
711 ether_sprintf(wh->i_addr2), rssi);
712 }
713 #endif
714 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
715 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
716 wh, NULL, "%s", "WEP set but not permitted");
717 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
718 goto out;
719 }
720 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
721 goto out;
722
723 case IEEE80211_FC0_TYPE_CTL:
724 vap->iv_stats.is_rx_ctl++;
725 IEEE80211_NODE_STAT(ni, rx_ctrl);
726 goto out;
727
728 default:
729 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
730 wh, "bad", "frame type 0x%x", type);
731 /* should not come here */
732 break;
733 }
734 err:
735 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
736 out:
737 if (m != NULL) {
738 if (need_tap && ieee80211_radiotap_active_vap(vap))
739 ieee80211_radiotap_rx(vap, m);
740 m_freem(m);
741 }
742 return type;
743 }
744
745 static void
wds_recv_mgmt(struct ieee80211_node * ni,struct mbuf * m0,int subtype,const struct ieee80211_rx_stats * rxs,int rssi,int nf)746 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
747 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
748 {
749 struct ieee80211vap *vap = ni->ni_vap;
750 struct ieee80211com *ic = ni->ni_ic;
751 struct ieee80211_frame *wh;
752 u_int8_t *frm, *efrm;
753
754 wh = mtod(m0, struct ieee80211_frame *);
755 frm = (u_int8_t *)&wh[1];
756 efrm = mtod(m0, u_int8_t *) + m0->m_len;
757 switch (subtype) {
758 case IEEE80211_FC0_SUBTYPE_ACTION:
759 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
760 if (ni == vap->iv_bss) {
761 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
762 wh, NULL, "%s", "unknown node");
763 vap->iv_stats.is_rx_mgtdiscard++;
764 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
765 /* NB: not interested in multicast frames. */
766 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
767 wh, NULL, "%s", "not for us");
768 vap->iv_stats.is_rx_mgtdiscard++;
769 } else if (vap->iv_state != IEEE80211_S_RUN) {
770 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
771 wh, NULL, "wrong state %s",
772 ieee80211_state_name[vap->iv_state]);
773 vap->iv_stats.is_rx_mgtdiscard++;
774 } else {
775 if (ieee80211_parse_action(ni, m0) == 0)
776 (void)ic->ic_recv_action(ni, wh, frm, efrm);
777 }
778 break;
779
780 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
781 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
782 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
783 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
784 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
785 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
786 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
787 case IEEE80211_FC0_SUBTYPE_BEACON:
788 case IEEE80211_FC0_SUBTYPE_ATIM:
789 case IEEE80211_FC0_SUBTYPE_DISASSOC:
790 case IEEE80211_FC0_SUBTYPE_AUTH:
791 case IEEE80211_FC0_SUBTYPE_DEAUTH:
792 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
793 wh, NULL, "%s", "not handled");
794 vap->iv_stats.is_rx_mgtdiscard++;
795 break;
796
797 default:
798 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
799 wh, "mgt", "subtype 0x%x not handled", subtype);
800 vap->iv_stats.is_rx_badsubtype++;
801 break;
802 }
803 }
804